AS8515 datasheet(33/65 Pages) AMSCO

33 / 65 page

www.ams.com

Revision 0.7

33 - 65

AS8515

Datasheet - AS8515 Bottom Die Overvi ew

8.7.4 Standby Mode2 (SBM2)

Standby Mode 2 is an extension of the Standby Mode1 to achieve even a lower power in the data acquisition system by providing interrupt to the

microcontroller only when the data sample exceeds the set current threshold. The Standby Mode can be entered only through the STOP state.

Transition to SBM2 mode occurs when the “START BIT” D0 of Mode Control register MOD_CTL_REG in Table 49 is set to “1” and Mode Control

Bits D7,D6 to “1,1” through SPI. In this mode the date rate is programmable with the time of Ta in the Ta control registers B, C. The data sample

is made available and an interrupt signal is generated on INT pin only when the input signal exceeds the threshold set in Current Threshold

Registers D,E. It should be noted here that the data is stable for Ta seconds. The functionality is illustrated in Figure 22.

Figure 22. Standby Mode 2

8.8 Initialization Sequence at Power ON

Figure 23. Bottom Die Device Initialization Sequence at Power ON

Device initialization starts if the DVDD and AVDD supplies are switched ON and DVDD > VPORHID. The duration period of Initialization is 500

μsec

and during this period, INT pin toggles at the rate of internal low power oscillator. Toggling on INT during the period of initialization should be

ignored in the system. Device configuration and activation should be carried out only after the initialization period.

On ADC start, device enters into analog stabilization state and takes 1.5msec for oscillator and Reference to settle. After this 1.5msec period, the

first interrupt will occur after a time period of TADC.

ADC

Tconv

Start SBM2

Ta sec.

IDD

Tconv

MCU

|I| > I Threshold

INT

Channel

DATA Register

DATA – A1

DATA – A0

DATA – A2

DATA – A3

TINT

Configure

Device

Start

ADC

DVDD/AVDD

POR_N

INT

CHOP_CLK

Channel Data

0x0000

DATA1

DATA2

500µS

1.5mS

TDATA_STATUS_RD

TDATA_VALID

TDATA_INVALID

VPORHID/VPORHIA

TADC

AS8515 Datenblatt(PDF) 33 Page - ams AG

AS8515 Datenblatt(HTML) 33 Page - ams AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65

Datenblatt Download

Link URL